1995 Vol.17 No.4, Published: 19 July 1995
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Wang Shoujue①; Wu Xunwei②; Shi Ying①; Jin Ou②
THE NEW SUPER-HIGH-SPEED DIGITAL CIRCUIT BASED ON LINEAR AND-OR GATES
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1995 Vol. 17 (4): 337-344
[Abstract]
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2007 )
[PDF 1385KB]
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510
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DOI:
The paper reveals the relation between linear AND-OR gate and the Emitter Function Logic (EFL). With theoretic calculation and PSPICE simulation, the paper proves that the linear AND-OR gates can work at super-high-speed and can be multi-cascaded. On the basis of analyzing the high-speed switch units which coordinate with linear AND-OR gates, two kinds of Emitter Coupled Logic (ECL) circuits are designed. The paper also discusses the design principle of super-high-speed digital circuits and some examples of combinational and sequential circuits using linear AND-OR gate are given.
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Dong Wei; Jiang Li; Li Lian
THE DESIGN OF BALANCED AMPLIFIER BASED ON COMMON-MODE FEEDBACK
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1995 Vol. 17 (4): 345-351
[Abstract]
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1641 )
[PDF 1271KB]
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795
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DOI:
The balanced operational amplifier including its merits and designing methods is discussed by comparing its performance to a conventional differential output amplifier when used in a single balanced stage. A new balanced OTA circuit design is also presented.
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Liu Xiaohe
DYNAMIC PROPERTIES OF CONTINUOUS UNSYMMETIC NEURAL NETWORKS
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1995 Vol. 17 (4): 352-358
[Abstract]
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1429 )
[PDF 972KB]
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520
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DOI:
The dynamic properties of continuous unsymmetic neural networks are discussed, and the condition of existence of unique equilibrium point is obtained. The conditions not producing static state bifurcation and Hopf bifurcation are put forward and the sufficient conditions of overall asymptotic stability and exponential stability are obtained.
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Cai Jinding; Huang Dongquan
INTERVAL ANALYSIS OF ADEQUATE SELEC-TION OF ACCESSIBLE NODES IN A TOLERANCE NETWORK
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1995 Vol. 17 (4): 359-364
[Abstract]
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1946 )
[PDF 979KB]
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587
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DOI:
A new mathematical method——interval analysis is applied as a tool for fault diagnosis in a tolerance network. The adequate selection of accessible nodes for fault diagnosis at subnetwork-level is investigated by using the method. This is a key problem often encountered in the engineering.
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Tan Lijun; Li Lemin
INTRACELL C/I BALANCING TECHNIQUES FOR UPLINKS OF A MULTI-CELL CELLULAR CDMA SYSTEM
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1995 Vol. 17 (4): 365-371
[Abstract]
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1535 )
[PDF 1176KB]
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513
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DOI:
Two intracell C/I balancing techniques are presented for controlling mobiles transmitter powers on the uplinks of a multi-cell cellular CDMA (Code Division Multiple Access) system in order to compensate the combined effects of shadowing and path loss, with their performance being evaluated in terms of cell-averaged outage probability which is different from the traditional index.
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Zhao Zhiqin; Xiong Simin; Huang Shunji
THE ANALYSIS OF COMPATIBLE SYSTEM OF AMTI AND SAR
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1995 Vol. 17 (4): 372-377
[Abstract]
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1497 )
[PDF 1444KB]
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466
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DOI:
Based on the analysis of Adaptive Moving Target Indication (AMTI), and the signal processing of Synthetic Aperture Radar (SAR), a complete compatible system of AMTI and SAR is put forward. The compatibility and effectiveness of this system is proved in theory. The resutls of simulation show that this system not only has the good ability of imaging stationary targets but also has the ability of detecting moving targets under the background of strong clutter.
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Qi Songxin; Yang Quanrang
FULL-WAVE ANALYSIS OF THE HIGH-SPEED INTEGRATED TRANSMISSION LINE DISCONTINUITIES
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1995 Vol. 17 (4): 378-384
[Abstract]
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1615 )
[PDF 1061KB]
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529
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A new time domain finite difference method with variable grids of high accuracy is derived by the polynomial approximation, and applied to analyze the variable-angle transmission line discontinuities. The method has the advantages of comparatively less memory space and CPU time, and is much simpler than other techniques. Test results are in good agreement with published data, thereby the accuracy of the new method is verified.
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Yin Yuanzhao
CHARACTERISTIC STUDY OF A FREE ELECTRON LASER WITH LINEARLY PALARIZED WIGGLER AND RECTANGULAR WAVEGUIDE
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1995 Vol. 17 (4): 385-390
[Abstract]
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1595 )
[PDF 869KB]
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447
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DOI:
The characteristics of coherent radiation produced by a cylindrical electron beam passing through a rectangular waveguide and linearly polarized wig-gler is studied. The instability analysis is based on the linearized Vlasov-Maxwell equations for the perturbations about a self-consistent beam equilibrium. The dispersion equation of TMmn mode is deduced and by making use of numerical calculation the radiation frequency and growth rate as a function of electron beam energy and radius, axial magnetic field, wiggler field and wave lengthare presented and discus sed.
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Cui Suomin; Wang Maoguang
A HYBRID METHOD FOR TE SCATTERING BY A PERFECTLY CONDUCTING SEMICYLINDER
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1995 Vol. 17 (4): 391-396
[Abstract]
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1602 )
[PDF 1018KB]
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608
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Bistatic scattering of a perfectly conducting semicylinder is analysed by using a hybrid method. In the hybrid method, the currents in the close vicinity of edges are represented as unknown coefficients; the first-order currents on the curved face are obtained by Fock theory; the high-order currents are described as the Fock type functions involving two unknown coefficients. The first-order currents on planar surface are physical optical currents and diffraction currents obtained by the uniform geometrical theory of diffraction form involving two unknown coefficients. The magnetic field equation is solved to obtained four coefficients and the currents in the close vicinity of the edges. The results obtained by the hybrid method are in good agreement with the results of moment method.
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Yang Chao; Ruan Yingzheng; Feng Lin
ANALYSIS OF MICROSTRIP WRAP-AROUND ANTENNA BASED ON DYADIC GREEN S FUNCTIONS
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1995 Vol. 17 (4): 397-403
[Abstract]
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1671 )
[PDF 992KB]
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793
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The general field expressions for conformal microstrip antennas on cylindrical body are derived based on dyadic Green s functions for concentric-cylindrical layered media. The radiation patterns for various radii, permittivities, and thickness of the dielectric layer of a microstrip wrap-around antenna are obtained using the general field expressions and electric surface current model.
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Liang Yingchang; Zhang Xianda; Li Yanda
AN OVERVIEW OF THE HARMONIC RETRIEVAL IN NOISE
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1995 Vol. 17 (4): 404-411
[Abstract]
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1963 )
[PDF 1499KB]
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655
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Recently, Higher-order statistics have become powerful tools in signal processing field and have been applicable in harmonic retrieval. This paper first analyses the existing correlation-based methods for harmonic retrieval; then summarizes the newly developed higher-order statistics-based approaches and pre-filtering-based methods with hybrid higher-order statistics for estimating parameters of harmonics in noise. It is shown that higher-order statistics-based approaches are superior to correlation based approaches in restraining colored noise and retrieving useful information of harmonics.
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Jiang Gangyi; Zhang Lihe; Cai Jinhai;Zheng Yi
A NEW DESIGN ALGORITHM FOR WAVEFORM VECTOR QUANTIZER OF SPEECH SIGNAL
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1995 Vol. 17 (4): 412-416
[Abstract]
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1452 )
[PDF 750KB]
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484
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DOI:
Characteristic varibles of waveform vector quantizer of speech signal are presented and used to analyze codebook and its training sequence. It includes three parts, i. e., constructing initial codebook efficiently, training codebook fast and quantizing input vectors fast. Computer simulations show that the training speed of codebook is quickened by the new design algorithm and the complexity of vector quantizer is reduced.
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Guo Kaizhou①; Zhou Quan①; Ma Jun①;Yang Binzhou②; Zhao Wei②
AN EXPERIMENTAL STUDY ON PHOTOCONDUCTIVE SEMICONDUCTOR SWITCHES
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1995 Vol. 17 (4): 421-425
[Abstract]
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1604 )
[PDF 1028KB]
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534
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By using the apparatus given in this paper the experiment on photo-conductive switches was conducted to investigate the affection of both the laser energy and bias voltage on switch output. By means of the same set-up, the carrier lifetime of Cr: GaAs used was measured to be as 1.8ns, and the possibility of the set-up to be utilized as a high speed photodetector has been demonstrated.
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Jin Enpei
GRAPHIC METHOD FOR METAL-CLAD PLANAR OPTICAL WAVEGUIDES
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1995 Vol. 17 (4): 426-429
[Abstract]
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1551 )
[PDF 548KB]
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478
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A simple graphic method for obtaining the real and imaginary parts of the propagation constant β of metal-clad planar optical waveguides is presented. This method is straightforward, accurate and valuable
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Lan Kang; Wang Jian; Peng Zhongqiu
TRANSIENT EM FIELDS SCATTERING BY UNDERGROUND OBJECTS
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1995 Vol. 17 (4): 434-437
[Abstract]
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1638 )
[PDF 743KB]
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530
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DOI:
Transient EM field scattering by underground objects using finite-difference method in time-domain (FDTD) is calculated, and object s response of an EM pulse related to dielectric parameters and underground structure is presented. Conclusions of this method can be used as theoretical evidences of object detecting and discriminating. The method can be applied to circumstances of arbitrary cylinder objects and two-dimensional underground structure, and can be developed to three-dimensional circumstances.
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Xu Shanjia; Wang Feng
IMPROVED MODE-MATCHING AND NETWORK ANALYSIS OF E-PLANE WAVEGUIDE BRANCH DIRECTIONAL COUPLERS
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1995 Vol. 17 (4): 438-442
[Abstract]
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1756 )
[PDF 763KB]
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539
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The E-plane waveguide branch directional couplers are analysed by a method which combines the multi-mode network theory with rigorious mode matching approach. The electromagnetic field components are expanded by the superposition of LSEx modes rather than TE and TM modes in the mode matching procedure. Meanwhile, the electromagnetic problem is transferred into the network problem through the mode matching treatment. It is shown that the present method has the advantages of simplicity and less computation with unaffecting the accuracy of the calculation.
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Chen Li; Qiu Guanyuan
ANALYSIS OF NONIDEAL EFFECTS ON CCII-BASED FULLY INTEGRATED CONTINUOUS-TIME FILTERS
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1995 Vol. 17 (4): 443-448
[Abstract]
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1503 )
[PDF 884KB]
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1026
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DOI:
The error functions of CCII-based integrators are analysed. On this basis, the fully integrated CCII-based continuous-time bandpass filters consisted of double integrator loops are studied, and the relationship between the centre frequency ωp and Qp and the magnitude E and the phase θE of the error function is also discussed. The effects of nonideal CCII are considered in detail. The conclusions obtained may provide foundation and improvement for the design of CCII-based MOSFET continuous-time higher order filters.
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